Modbus Addressing (Modbsid) - Honeywell 301 Serie Mode D'emploi

MODbus Addressing (ModbsID)

This option lets you set a different Modbus address than the factory set address.
The 301-ADI Modbus address must be set to 097 for
it to be recognized by the 301-C and AA96D control-
lers.
When you first access the Modbus ID option, the screen displays the current address with the first character
underlined.
Use the UP or DOWN buttons to increase or decrease the character value.
•
When the correct value is displayed, press ENTER.
•
Continue until all characters are set as desired for the new Modbus address
•
Press ESC to return to the previous menu.
•
Using the 301-ADI with the 420MDBS (Scale)
When used with the 301-ADI and the 420MDBS, the 301-C menu "Scale" option (within the Tx Info menu) al-
lows users to scale their 4-20 mA signal to more practical reading values. This menu also allows the system to
display values below 4mA (for non-standard devices that operate on a 0 - 20 mA range).
The Scale menu option is composed of two screens that let you set specific data for your scale conversion:
Min, Max, (scaling) factor and
Units (of measurement):
The basic Engineering Unit* conversion formula for standard 4-20 mA devices is:
Here are two examples of the scale conversion formula:
(12 mA - 4 mA) x (1000 ppm - 0
Example
ppm)
1:
(20 mA - 4 mA) x 1
Example 1 result = 500 ppm
(12 mA - 4 mA) x (+500 ºC - -200
Example
ºC)
2:
(20 mA - 4 mA) x 10
Example 2 result = 15.0 ºC
In the example 2, the range is multiplied by a factor of 10, which allows you to obtain a range of +50.0ºC
Note:
to -20.0ºC with a precision of one decimal point.
*Engineering units represent the following measurement types: %, ppm, ºC, ºF and RH.
77
1. Tx info 001
-Scale(1)-
Max 00250
Min 00000
(Loop current - 4 mA) x (range max -
range min)
20 mA - 4 mA) x (specified factor)
1. Tx info
-Scale(2)-
Factor 00001
Units
+
range min
specified fac-
tor
+ 0 ppm
1
+ 200 °C
10
ModbsID
097
001
ppm